铯、锶在花岗岩及其成岩矿物上的吸附研究——吸附等温线的测定及能量不均匀吸附等温模型  

THE MEASUREMENTS OF ADSORPTION ISOTHERMS OF Cs AND Sr ON GRANITE AND ITS COMPONENT MINERALS IN TWICE-DISTILLED WATER—a Model of Energetically Heterogeneous Adsorption Isotherm

作　　者：赵欣[1] 魏连生[1] 林漳基[1] 汪德熙[1] 

机构地区：[1]中国原子能科学研究院

出　　处：《核科学与工程》1993年第2期148-154,7,共7页Nuclear Science and Engineering

摘　　要：测定了Cs、Sr在花岗岩及其成岩矿物(钾长石、钠长石、石英、黑云母、角闪石)中的吸附等温线。结果表明,Cs、Sr在花岗岩及钾长石、钠长石、黑云母、角闪石中的吸附可用Freundlich等温方程描述,Cs、Sr在石英中不吸附。在假定各矿物是由各能量不相同的吸附点组成,且某一吸附点上的局部等温式可用Freundlich方程表示,吸附物质各点的能量分布可用γ几率函数描述的基础上,本文推导出了能量不均匀吸附物质的吸附等温模型,并得到了实验结果的验证。Results of the measurements of adsorption isotherms of Cs and Sr on Granite and its component minerals (microcline, albite, quartz, biotite and hornblends) in twice-distilled water indicate that the adsorption of Cs and Sr can be described by the Freundlich equation of the adsorption isotherm. The equation to describe the adsorption characteristic of an energetically heterogeneous adsorbent is derived by assuming that the adsorbent consists of a combination of adsorption sits with energies heterogeneously distributed and that the local adsorption on any one site can be described by the Freundlich equation. Experimental results show that the adsorption of Cs and Sr can be described by the energetically heterogeneous adsorption isotherm. This indicate that the adsorption mechanism is cation exchange of single species at energetically different sites.

关 键 词：铯 锶 吸附 花岗岩 放射性同位素 

分 类 号：O647.32[理学—物理化学]